class Student(object):
    def __init__(self, name, age, grade):
        self.__name = name
        self.__age = age
        self.__grade = grade

    def print(self  ):
        print(self.__name, self.__age, self.__grade)

    def set_name(self, name):
        self.__name = name

if __name__ == '__main__':
    s = Student('Alice', 18, 3)
    s.print()